Avila Santibáñez, R., González Montiel, J.C., Miranda Hernández, P. and Guzmán González, M. de L. 2010. Stimuli effects on optimal behavior in a sunk-cost situation with pigeons. Mexican Journal of Behavior Analysis. 36, 1 (May 2010), 19–31. DOI:https://doi.org/10.5514/rmac.v36.i1.18012.